Antimatter Definition and 288 Threads

A black hole is basically extremely dense matter. What could happen if it interacted with antimatter? I guess a part of the black hole's mass would annihilate.

Just about everything I have read about antimatter talks about proton/antiproton, electron/antielectron, and neutron/antineutron annihilation. But what happens if, for example, a proton and an antineutron collide? Would a weird nucleus be created or would there be a partial annihilation...

Observations have led to the conclusion that the Universe contains dark matter, a form of matter that has mass and therefore gravity, but apparently doesn't interact otherwise with 'normal' matter. It's existence is unexplained. Then there is the puzzle of antimatter, a form of baryonic normal...

Hi All, First time poster here, and I've got a couple questions. Straight up, I'm writing a sci-fi story where antimatter is utilised as fuel (feel free to laugh at the cliche), and I want to portray it as realistically as possible. To that end, I've come up with a storage method and I want to...

Now it is common knowledge that antiparticles destroy particles on collision, and release the same amount of energy as if the masses of the two particles were combined and plugged into E=mc^2. But what about an antiparticle colliding with another antiparticle? Would they have the same effect on...

do we know what the proportions of antimatter is compared to matter ?? like does gravity electromagnetism the strong and weak forces exc...as well as other thing like does it react to it self the same way matter does to it self??

A matter-antimatter pair have opposite spins and charges. Is this the same for parity?

ok guys this should be a quick one... I hope lol In supersymmetry could the other have of the particles be antimatter ?? its looking like the same thing to me... but I could be very wrong. But if I am, why would I be wrong ?? thank you to anyone that takes the time to replay

I need someone to clarify where I have erred: At the start of the universe, there should have been equal amounts of matter and Antimatter created, but we appear to live in a matter dominated universe. If matter and antimatter mutually annihilate into energy, and energy and matter are...

AFAIK antimatter was produced equality in the big bang, and in the matter antimatter fight the matter won . Does antimatter react to gravity the same as matter, surly if it does then the antimatter will be annihilated due to matter antimatter mixing IF matter repels antimatter how did the...

Why is matter more than antimatter ?? Just a mere curiosity ! Thanks in advance

CPT symmetry and antimatter gravity in general relativity M. Villata Published 28 March 2011 • Europhysics Letters Association EPL (Europhysics Letters), Volume 94, Number 2 Abstract The gravitational behavior of antimatter is still unknown. While we may be confident that antimatter is...

Kindly allow a me to post this layman question. In popular science it is often stated that the very early universe should have produced approximately equal amounts of particles and antiparticles, and that the dominance of matter over antimatter in the current universe is somehow a mystery. They...

Why is antimatter difficult to create? I know that heavier particles are more difficult to create because you need a high energy collision to give the heavy particle any chance of being created. And i know why antiparticles are difficult to keep in existence and store AFTER they are created...

I have heard before that for every 1 billion antiparticles there are 1 billion and 1 particles of normal matter. Has this been observed directly or just predicted? Have we only observed antimatter through its creation on earth?

A short documentary on the LHCb experiment at CERN, on the quest for the mystery of Antimatter.

Black holes suggest anti-matter has negative matter but is this true? I think anti-matter has positive mass - e.g. a positron and electron annihilate giving off 0.5MeV + 0.5MeV photons where these photons have a huge positive energy. If the positron had negative mass then there would be no...

So I'm wonder How does the annihilation occur? Does the quarks pair up like magnets for matter and antimatter? Do matter and antimatter have the same quarks?

Is there any theory that says anti-information exists? If there is anti-matter, would that matter carry information to annihilate the regular matter's information saying its a certain type of matter and turn it into energy? Could anti-matter just be regular matter with anti-information.

Dear PF Forum, Just out of curiosity. What happens when an anti proton hits a 'normal' neutron? According to this: https://en.wikipedia.org/wiki/Proton https://en.wikipedia.org/wiki/Neutron A proton has 2 up quarks, 1 down quark A neutron has 1 up quark, 2 down quarks. 1. Does anti proton has 2...

How are the effects of antimatter on gravity different than regular matter?

Why do scientists think that dark matter annihilates just like antimatter? How is it that dark matter during annihilation can produce light when it cannot emit or absorb light itself?

I was watching a documentary on this subject that I found quite interesting. They put forth an explanation of why we see mostly matter in the universe. That after the big bang equal amounts of both matter and antimatter were created and that the decay rate of antimatter was responsible for the...

If you were to cover the equator of Mercury with solar panels, then used the poles for antimatter production, how much antimatter could you make in a day? http://www.centauri-dreams.org/?p=22962 This site makes some interesting points about how the cost of producing antimatter could be lowered...

Hello all. I had some questions on some of the specifics of matter-antimatter annihilation. I've tried looking this up but haven't had much success. If you guys know of any textbooks or journal articles that dig deep into the mechanics I'd be grateful if you'd post them. Anyway, my basic...

Well my question is two fold. Everyone knows that Antimatter anihlates matter on contact. Why? What causes this? Also as elements get heavier and heavier they are less and less stable. Would Antimatter become increasingly stable as you added more antiparticles?

What's the longest time antimatter was able to be stored?

So this doesn't so much explain baryonic asymmetry, as say that it isn't a thing. https://en.wikipedia.org/wiki/Rishon_model This leads to the question, how do we determine what is antimatter and what isn't? The electron is antimatter in this theory ##e^- = \bar{T}\bar{T}\bar{T}## One big...

hello everyone, i wasn't sure what category this should go under so General Physics was the safest bet. to my understanding when antimatter and normal matter collides its a 100% conversion into light, is this correct? if so, the conservation of mass says all the mass that was originally there...

As opposed to antimatter, that is. The whole search for the asymmetry of matter vs antimatter seems to rest on the implicit assumption that what we observe is matter, not antimatter, no? Is there a way of distinguishing from afar between the two?

Antimatter can be contained in magnetic fields; what if we could somehow "propel" that magnetic field by using a magnetic nozzle when the small antimatter-matter reactions/annihilation occurs which produces thrust? This seems like a really stupid idea, but can you tell me some limitations about...

Is an electron anti neutrino and a positron neutrino the same thing?

Hello All, I was wondering if anybody could recommend some really good, graduate-level textbooks or sources on quantum field theory and antiparticles. I've browsed through several QFT titles, but if anyone has any books they think would be a good grad-level introduction I'd be grateful...

What I have read about antimatter amounts to about this much: -Each particle is paired with an antiparticle, and when they meet, they annihilate. -When a particle and antiparticle annihilate, they produce energy and gamma rays. -It is hypothesized that before the Big Bang, there was an equal...

I apologize if this has been already asked , but I'm curious about how scientists first found out that such particles exist? Since they are equal in all other aspects except for charge , well my best guess would be that in the large hadron collidor and other particle accelerators they have mass...

It's to my understanding that the Large Hadron Collider is so 'large' due to the fact E=MC^2 and that when the accelerated particles approach the speed of light their mass increases logarithmic to a near infinite mass, meaning the magnetic force applied to the particle, to stop it from touching...

I was recently reading an article that attempted to explain how the results of the Cronin-Fitch experiment illustrated CP violation. (http://hyperphysics.phy-astr.gsu.edu/hbase/particles/cronin.html) However, it wasn't very well explained. Could someone please explain this to me?

Dear PF Forum, In less than 1 second after big bang, baryons were created. And there's asymmetry in it. Can anyone help me? 1. Is it physically possible for a galaxy made entirely from anti matter? 2. If it's true, is it statistically possible for a galaxy made entirely from anti matter? If...

Sorry for a bit of a sci fi question but are anti matter black holes likely, presumably they would need to come from whole antimatter stars in antimatter galaxies? otherwise they would already have destroyed themselves?

First I would like to say that I'm sorry if this question has been asked before- I'm new here. I was reading QED by Richard Feynman, and he mentioned that any given antiparticle is just it's regular particle counterpart moving backwards in time. How is this possible? I thought that it was only...

Hi guys, Well I read about Anti Matter, and i came across the term Anti particle and how a positron is the antiparticle of an electron, so when a particle and an antiparticle meet they're supposed to annihilate each other. So in case of a Beta+ decay where a proton is converted into a positron...

Or, more specifically, what determinates the frequency of the photons emitted by a such a collision. I know that the number of photons produced depends on the spin and energy states of the initial particles.

If antimatter moves in the direction it was pushed from, is this because it has its own sort of properties such as inertia in regular matter?

If inertia is a property of matter, does this mean that antimatter has some sort of different inertia? Again, haven't taken a physics class science I'm only in junior high. Please don't judge me

If you had a ball of matter and anti-matter in a vacuum and threw them at each other - would they just blow apart and go largely unreacted? What about in atmosphere - would the ball of anti-matter blow up or form a shell of exploding material around it insulating it like the boiling of liquid...

Hey! So I found this ( http://home.web.cern.ch/about/updates/2014/11/beamline-schools-competition-2015-launches-today ) and my high school's physics teachers liked the concept! So I've created a team to participate in this years contest. We were thinking to do something relevant with antimatter...

Recently I watched a lecture on Anti-matter and the Standard Model... ...At one point Dr. Quinn, makes the statement that the CMB is the resulting energy left over from the annihilation of the matter and anti-matter which arose during cosmic inflation (leaving behind only one part in 30 million...

Is antimatter time-reversed negative matter? If so, then it would behave like ordinary matter electromagnetically BUT Newton's grav would yield like mass charges attract and unlike masses repel. Ie, a combination of antimatter and matter does not make a diametric drive due to the time inversion...

Hi My question is about absence of equal antimatter in our universe: If charge and energy is conserved, then this means there was matter before big bang that crunched and created more particles. The charge before and after big bang is conserved; just when two protons are accelerated toward each...

If Antimatter was completely annihilated after the Big Bang, how is it that we have studied it. As well as artificially created it? If we can't create normal matter, why would we be able to create antimatter? And since we can, why doesn't it immediately get annihilated from the contact of the...